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libsigrok/hardware/fx2lafw/fx2lafw.c

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/*
* This file is part of the sigrok project.
*
* Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
* Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <libusb.h>
#include "config.h"
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "fx2lafw.h"
#include "command.h"
static const struct fx2lafw_profile supported_fx2[] = {
/*
* CWAV USBee AX
* EE Electronics ESLA201A
* ARMFLY AX-Pro
*/
{ 0x08a9, 0x0014, "CWAV", "USBee AX", NULL,
FIRMWARE_DIR "/fx2lafw-cwav-usbeeax.fw",
0 },
/*
* CWAV USBee DX
* XZL-Studio DX
*/
{ 0x08a9, 0x0015, "CWAV", "USBee DX", NULL,
FIRMWARE_DIR "/fx2lafw-cwav-usbeedx.fw",
DEV_CAPS_16BIT },
/*
* CWAV USBee SX
*/
{ 0x08a9, 0x0009, "CWAV", "USBee SX", NULL,
FIRMWARE_DIR "/fx2lafw-cwav-usbeesx.fw",
0 },
/*
* Saleae Logic
* EE Electronics ESLA100
* Robomotic MiniLogic
* Robomotic BugLogic 3
*/
{ 0x0925, 0x3881, "Saleae", "Logic", NULL,
FIRMWARE_DIR "/fx2lafw-saleae-logic.fw",
0 },
/*
* Default Cypress FX2 without EEPROM, e.g.:
* Lcsoft Mini Board
* Braintechnology USB Interface V2.x
*/
{ 0x04B4, 0x8613, "Cypress", "FX2", NULL,
FIRMWARE_DIR "/fx2lafw-cypress-fx2.fw",
DEV_CAPS_16BIT },
/*
* Braintechnology USB-LPS
*/
{ 0x16d0, 0x0498, "Braintechnology", "USB-LPS", NULL,
FIRMWARE_DIR "/fx2lafw-braintechnology-usb-lps.fw",
DEV_CAPS_16BIT },
{ 0, 0, 0, 0, 0, 0, 0 }
};
static const int hwcaps[] = {
SR_HWCAP_LOGIC_ANALYZER,
SR_HWCAP_SAMPLERATE,
/* These are really implemented in the driver, not the hardware. */
SR_HWCAP_LIMIT_SAMPLES,
SR_HWCAP_CONTINUOUS,
0,
};
static const char *probe_names[] = {
"0",
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"10",
"11",
"12",
"13",
"14",
"15",
NULL,
};
static const uint64_t supported_samplerates[] = {
SR_KHZ(20),
SR_KHZ(25),
SR_KHZ(50),
SR_KHZ(100),
SR_KHZ(200),
SR_KHZ(250),
SR_KHZ(500),
SR_MHZ(1),
SR_MHZ(2),
SR_MHZ(3),
SR_MHZ(4),
SR_MHZ(6),
SR_MHZ(8),
SR_MHZ(12),
SR_MHZ(16),
SR_MHZ(24),
0,
};
static const struct sr_samplerates samplerates = {
0,
0,
0,
supported_samplerates,
};
static libusb_context *usb_context = NULL;
SR_PRIV struct sr_dev_driver fx2lafw_driver_info;
static struct sr_dev_driver *fdi = &fx2lafw_driver_info;
static int hw_dev_close(struct sr_dev_inst *sdi);
static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
const void *value);
static int hw_dev_acquisition_stop(const struct sr_dev_inst *sdi,
void *cb_data);
/**
* Check the USB configuration to determine if this is an fx2lafw device.
*
* @return TRUE if the device's configuration profile match fx2lafw
* configuration, FALSE otherwise.
*/
static gboolean check_conf_profile(libusb_device *dev)
{
struct libusb_device_descriptor des;
struct libusb_device_handle *hdl;
gboolean ret;
unsigned char strdesc[64];
hdl = NULL;
ret = FALSE;
while (!ret) {
/* Assume the FW has not been loaded, unless proven wrong. */
if (libusb_get_device_descriptor(dev, &des) != 0)
break;
if (libusb_open(dev, &hdl) != 0)
break;
if (libusb_get_string_descriptor_ascii(hdl,
des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
break;
if (strncmp((const char *)strdesc, "sigrok", 6))
break;
if (libusb_get_string_descriptor_ascii(hdl,
des.iProduct, strdesc, sizeof(strdesc)) < 0)
break;
if (strncmp((const char *)strdesc, "fx2lafw", 7))
break;
/* If we made it here, it must be an fx2lafw. */
ret = TRUE;
}
if (hdl)
libusb_close(hdl);
return ret;
}
static int fx2lafw_dev_open(struct sr_dev_inst *sdi)
{
libusb_device **devlist;
struct libusb_device_descriptor des;
struct context *ctx;
struct version_info vi;
int ret, skip, i;
uint8_t revid;
ctx = sdi->priv;
if (sdi->status == SR_ST_ACTIVE)
/* already in use */
return SR_ERR;
skip = 0;
const int device_count = libusb_get_device_list(usb_context, &devlist);
if (device_count < 0) {
sr_err("fx2lafw: Failed to retrieve device list (%d)",
device_count);
return SR_ERR;
}
for (i = 0; i < device_count; i++) {
if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
sr_err("fx2lafw: Failed to get device descriptor: %d.",
ret);
continue;
}
if (des.idVendor != ctx->profile->vid
|| des.idProduct != ctx->profile->pid)
continue;
if (sdi->status == SR_ST_INITIALIZING) {
if (skip != sdi->index) {
/* Skip devices of this type that aren't the one we want. */
skip += 1;
continue;
}
} else if (sdi->status == SR_ST_INACTIVE) {
/*
* This device is fully enumerated, so we need to find
* this device by vendor, product, bus and address.
*/
if (libusb_get_bus_number(devlist[i]) != ctx->usb->bus
|| libusb_get_device_address(devlist[i]) != ctx->usb->address)
/* this is not the one */
continue;
}
if (!(ret = libusb_open(devlist[i], &ctx->usb->devhdl))) {
if (ctx->usb->address == 0xff)
/*
* first time we touch this device after firmware upload,
* so we don't know the address yet.
*/
ctx->usb->address = libusb_get_device_address(devlist[i]);
} else {
sr_err("fx2lafw: Failed to open device: %d.", ret);
break;
}
ret = command_get_fw_version(ctx->usb->devhdl, &vi);
if (ret != SR_OK) {
sr_err("fx2lafw: Failed to retrieve "
"firmware version information.");
break;
}
ret = command_get_revid_version(ctx->usb->devhdl, &revid);
if (ret != SR_OK) {
sr_err("fx2lafw: Failed to retrieve REVID.");
break;
}
/*
* Changes in major version mean incompatible/API changes, so
* bail out if we encounter an incompatible version.
* Different minor versions are OK, they should be compatible.
*/
if (vi.major != FX2LAFW_REQUIRED_VERSION_MAJOR) {
sr_err("fx2lafw: Expected firmware version %d.x, "
"got %d.%d.", FX2LAFW_REQUIRED_VERSION_MAJOR,
vi.major, vi.minor);
break;
}
sdi->status = SR_ST_ACTIVE;
sr_info("fx2lafw: Opened device %d on %d.%d "
"interface %d, firmware %d.%d, REVID %d.",
sdi->index, ctx->usb->bus, ctx->usb->address,
USB_INTERFACE, vi.major, vi.minor, revid);
break;
}
libusb_free_device_list(devlist, 1);
if (sdi->status != SR_ST_ACTIVE)
return SR_ERR;
return SR_OK;
}
static int configure_probes(struct context *ctx, GSList *probes)
{
struct sr_probe *probe;
GSList *l;
int probe_bit, stage, i;
char *tc;
for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
ctx->trigger_mask[i] = 0;
ctx->trigger_value[i] = 0;
}
stage = -1;
for (l = probes; l; l = l->next) {
probe = (struct sr_probe *)l->data;
if (probe->enabled == FALSE)
continue;
if (probe->index > 8)
ctx->sample_wide = TRUE;
probe_bit = 1 << (probe->index - 1);
if (!(probe->trigger))
continue;
stage = 0;
for (tc = probe->trigger; *tc; tc++) {
ctx->trigger_mask[stage] |= probe_bit;
if (*tc == '1')
ctx->trigger_value[stage] |= probe_bit;
stage++;
if (stage > NUM_TRIGGER_STAGES)
return SR_ERR;
}
}
if (stage == -1)
/*
* We didn't configure any triggers, make sure acquisition
* doesn't wait for any.
*/
ctx->trigger_stage = TRIGGER_FIRED;
else
ctx->trigger_stage = 0;
return SR_OK;
}
static struct context *fx2lafw_dev_new(void)
{
struct context *ctx;
if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
sr_err("fx2lafw: %s: ctx malloc failed.", __func__);
return NULL;
}
ctx->trigger_stage = TRIGGER_FIRED;
return ctx;
}
static int clear_instances(void)
{
GSList *l;
struct sr_dev_inst *sdi;
struct context *ctx;
int ret;
ret = SR_OK;
for (l = fdi->instances; l; l = l->next) {
if (!(sdi = l->data)) {
/* Log error, but continue cleaning up the rest. */
sr_err("fx2lafw: %s: sdi was NULL, continuing.",
__func__);
ret = SR_ERR_BUG;
continue;
}
if (!(ctx = sdi->priv)) {
/* Log error, but continue cleaning up the rest. */
sr_err("fx2lafw: %s: sdi->priv was NULL, continuing",
__func__);
ret = SR_ERR_BUG;
continue;
}
hw_dev_close(sdi);
sdi = l->data;
sr_dev_inst_free(sdi);
}
g_slist_free(fdi->instances);
fdi->instances = NULL;
return ret;
}
/*
* API callbacks
*/
static int hw_init(void)
{
if (libusb_init(&usb_context) != 0) {
sr_warn("fx2lafw: Failed to initialize libusb.");
return SR_ERR;
}
return SR_OK;
}
static GSList *hw_scan(GSList *options)
{
GSList *devices;
struct libusb_device_descriptor des;
struct sr_dev_inst *sdi;
const struct fx2lafw_profile *prof;
struct context *ctx;
struct sr_probe *probe;
libusb_device **devlist;
int devcnt, num_logic_probes, ret, i, j;
/* Avoid compiler warnings. */
(void)options;
/* This scan always invalidates any previous scans. */
clear_instances();
/* Find all fx2lafw compatible devices and upload firmware to them. */
devices = NULL;
libusb_get_device_list(usb_context, &devlist);
for (i = 0; devlist[i]; i++) {
if ((ret = libusb_get_device_descriptor(
devlist[i], &des)) != 0) {
sr_warn("fx2lafw: Failed to get device descriptor: %d.", ret);
continue;
}
prof = NULL;
for (j = 0; supported_fx2[j].vid; j++) {
if (des.idVendor == supported_fx2[j].vid &&
des.idProduct == supported_fx2[j].pid) {
prof = &supported_fx2[j];
}
}
/* Skip if the device was not found */
if (!prof)
continue;
devcnt = g_slist_length(fdi->instances);
sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
prof->vendor, prof->model, prof->model_version);
if (!sdi)
return NULL;
sdi->driver = fdi;
/* Fill in probelist according to this device's profile. */
num_logic_probes = prof->dev_caps & DEV_CAPS_16BIT ? 16 : 8;
for (j = 0; j < num_logic_probes; j++) {
if (!(probe = sr_probe_new(j, SR_PROBE_LOGIC, TRUE,
probe_names[j])))
return NULL;
sdi->probes = g_slist_append(sdi->probes, probe);
}
ctx = fx2lafw_dev_new();
ctx->profile = prof;
sdi->priv = ctx;
fdi->instances = g_slist_append(fdi->instances, sdi);
devices = g_slist_append(devices, sdi);
if (check_conf_profile(devlist[i])) {
/* Already has the firmware, so fix the new address. */
sr_dbg("fx2lafw: Found an fx2lafw device.");
sdi->status = SR_ST_INACTIVE;
ctx->usb = sr_usb_dev_inst_new
(libusb_get_bus_number(devlist[i]),
libusb_get_device_address(devlist[i]), NULL);
} else {
if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
prof->firmware) == SR_OK)
/* Remember when the firmware on this device was updated */
ctx->fw_updated = g_get_monotonic_time();
else
sr_err("fx2lafw: Firmware upload failed for "
"device %d.", devcnt);
ctx->usb = sr_usb_dev_inst_new
(libusb_get_bus_number(devlist[i]), 0xff, NULL);
}
}
libusb_free_device_list(devlist, 1);
return devices;
}
static int hw_dev_open(struct sr_dev_inst *sdi)
{
struct context *ctx;
int ret;
int64_t timediff_us, timediff_ms;
ctx = sdi->priv;
/*
* If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
* milliseconds for the FX2 to renumerate.
*/
ret = SR_ERR;
if (ctx->fw_updated > 0) {
sr_info("fx2lafw: Waiting for device to reset.");
/* takes at least 300ms for the FX2 to be gone from the USB bus */
g_usleep(300 * 1000);
timediff_ms = 0;
while (timediff_ms < MAX_RENUM_DELAY_MS) {
if ((ret = fx2lafw_dev_open(sdi)) == SR_OK)
break;
g_usleep(100 * 1000);
timediff_us = g_get_monotonic_time() - ctx->fw_updated;
timediff_ms = timediff_us / 1000;
sr_spew("fx2lafw: waited %" PRIi64 " ms", timediff_ms);
}
sr_info("fx2lafw: Device came back after %d ms.", timediff_ms);
} else {
ret = fx2lafw_dev_open(sdi);
}
if (ret != SR_OK) {
sr_err("fx2lafw: Unable to open device.");
return SR_ERR;
}
ctx = sdi->priv;
ret = libusb_claim_interface(ctx->usb->devhdl, USB_INTERFACE);
if (ret != 0) {
switch(ret) {
case LIBUSB_ERROR_BUSY:
sr_err("fx2lafw: Unable to claim USB interface. Another "
"program or driver has already claimed it.");
break;
case LIBUSB_ERROR_NO_DEVICE:
sr_err("fx2lafw: Device has been disconnected.");
break;
default:
sr_err("fx2lafw: Unable to claim interface: %d.", ret);
break;
}
return SR_ERR;
}
if (ctx->cur_samplerate == 0) {
/* Samplerate hasn't been set; default to the slowest one. */
if (hw_dev_config_set(sdi, SR_HWCAP_SAMPLERATE,
&supported_samplerates[0]) == SR_ERR)
return SR_ERR;
}
return SR_OK;
}
static int hw_dev_close(struct sr_dev_inst *sdi)
{
struct context *ctx;
ctx = sdi->priv;
if (ctx->usb->devhdl == NULL)
return SR_ERR;
sr_info("fx2lafw: Closing device %d on %d.%d interface %d.",
sdi->index, ctx->usb->bus, ctx->usb->address, USB_INTERFACE);
libusb_release_interface(ctx->usb->devhdl, USB_INTERFACE);
libusb_close(ctx->usb->devhdl);
ctx->usb->devhdl = NULL;
sdi->status = SR_ST_INACTIVE;
return SR_OK;
}
static int hw_cleanup(void)
{
int ret;
ret = clear_instances();
if (usb_context)
libusb_exit(usb_context);
usb_context = NULL;
return ret;
}
static int hw_info_get(int info_id, const void **data,
const struct sr_dev_inst *sdi)
{
struct context *ctx;
switch (info_id) {
case SR_DI_INST:
*data = sdi;
break;
case SR_DI_HWCAPS:
*data = hwcaps;
break;
case SR_DI_NUM_PROBES:
if (sdi) {
ctx = sdi->priv;
*data = GINT_TO_POINTER(
(ctx->profile->dev_caps & DEV_CAPS_16BIT) ?
16 : 8);
} else
return SR_ERR;
break;
case SR_DI_PROBE_NAMES:
*data = probe_names;
break;
case SR_DI_SAMPLERATES:
*data = &samplerates;
break;
case SR_DI_TRIGGER_TYPES:
*data = TRIGGER_TYPES;
break;
case SR_DI_CUR_SAMPLERATE:
if (sdi) {
ctx = sdi->priv;
*data = &ctx->cur_samplerate;
} else
return SR_ERR;
break;
default:
return SR_ERR_ARG;
}
return SR_OK;
}
static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
const void *value)
{
struct context *ctx;
int ret;
ctx = sdi->priv;
if (hwcap == SR_HWCAP_SAMPLERATE) {
ctx->cur_samplerate = *(const uint64_t *)value;
ret = SR_OK;
} else if (hwcap == SR_HWCAP_PROBECONFIG) {
ret = configure_probes(ctx, (GSList *) value);
} else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
ctx->limit_samples = *(const uint64_t *)value;
ret = SR_OK;
} else {
ret = SR_ERR;
}
return ret;
}
static int receive_data(int fd, int revents, void *cb_data)
{
struct timeval tv;
/* Avoid compiler warnings. */
(void)fd;
(void)revents;
(void)cb_data;
tv.tv_sec = tv.tv_usec = 0;
libusb_handle_events_timeout(usb_context, &tv);
return TRUE;
}
static void abort_acquisition(struct context *ctx)
{
int i;
ctx->num_samples = -1;
for (i = ctx->num_transfers - 1; i >= 0; i--) {
if (ctx->transfers[i])
libusb_cancel_transfer(ctx->transfers[i]);
}
}
static void finish_acquisition(struct context *ctx)
{
struct sr_datafeed_packet packet;
int i;
/* Terminate session */
packet.type = SR_DF_END;
sr_session_send(ctx->session_dev_id, &packet);
/* Remove fds from polling */
const struct libusb_pollfd **const lupfd =
libusb_get_pollfds(usb_context);
for (i = 0; lupfd[i]; i++)
sr_source_remove(lupfd[i]->fd);
free(lupfd); /* NOT g_free()! */
ctx->num_transfers = 0;
g_free(ctx->transfers);
}
static void free_transfer(struct libusb_transfer *transfer)
{
struct context *ctx = transfer->user_data;
unsigned int i;
g_free(transfer->buffer);
transfer->buffer = NULL;
libusb_free_transfer(transfer);
for (i = 0; i < ctx->num_transfers; i++) {
if (ctx->transfers[i] == transfer) {
ctx->transfers[i] = NULL;
break;
}
}
ctx->submitted_transfers--;
if (ctx->submitted_transfers == 0)
finish_acquisition(ctx);
}
static void resubmit_transfer(struct libusb_transfer *transfer)
{
if (libusb_submit_transfer(transfer) != 0) {
free_transfer(transfer);
/* TODO: Stop session? */
/* TODO: Better error message. */
sr_err("fx2lafw: %s: libusb_submit_transfer error.", __func__);
}
}
static void receive_transfer(struct libusb_transfer *transfer)
{
gboolean packet_has_error = FALSE;
struct sr_datafeed_packet packet;
struct sr_datafeed_logic logic;
struct context *ctx = transfer->user_data;
int trigger_offset, i;
/*
* If acquisition has already ended, just free any queued up
* transfer that come in.
*/
if (ctx->num_samples == -1) {
free_transfer(transfer);
return;
}
sr_info("fx2lafw: receive_transfer(): status %d received %d bytes.",
transfer->status, transfer->actual_length);
/* Save incoming transfer before reusing the transfer struct. */
uint8_t *const cur_buf = transfer->buffer;
const int sample_width = ctx->sample_wide ? 2 : 1;
const int cur_sample_count = transfer->actual_length / sample_width;
switch (transfer->status) {
case LIBUSB_TRANSFER_NO_DEVICE:
abort_acquisition(ctx);
free_transfer(transfer);
return;
case LIBUSB_TRANSFER_COMPLETED:
case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though */
break;
default:
packet_has_error = TRUE;
break;
}
if (transfer->actual_length == 0 || packet_has_error) {
ctx->empty_transfer_count++;
if (ctx->empty_transfer_count > MAX_EMPTY_TRANSFERS) {
/*
* The FX2 gave up. End the acquisition, the frontend
* will work out that the samplecount is short.
*/
abort_acquisition(ctx);
free_transfer(transfer);
} else {
resubmit_transfer(transfer);
}
return;
} else {
ctx->empty_transfer_count = 0;
}
trigger_offset = 0;
if (ctx->trigger_stage >= 0) {
for (i = 0; i < cur_sample_count; i++) {
const uint16_t cur_sample = ctx->sample_wide ?
*((const uint16_t*)cur_buf + i) :
*((const uint8_t*)cur_buf + i);
if ((cur_sample & ctx->trigger_mask[ctx->trigger_stage]) ==
ctx->trigger_value[ctx->trigger_stage]) {
/* Match on this trigger stage. */
ctx->trigger_buffer[ctx->trigger_stage] = cur_sample;
ctx->trigger_stage++;
if (ctx->trigger_stage == NUM_TRIGGER_STAGES ||
ctx->trigger_mask[ctx->trigger_stage] == 0) {
/* Match on all trigger stages, we're done. */
trigger_offset = i + 1;
/*
* TODO: Send pre-trigger buffer to session bus.
* Tell the frontend we hit the trigger here.
*/
packet.type = SR_DF_TRIGGER;
packet.payload = NULL;
sr_session_send(ctx->session_dev_id, &packet);
/*
* Send the samples that triggered it, since we're
* skipping past them.
*/
packet.type = SR_DF_LOGIC;
packet.payload = &logic;
logic.unitsize = sizeof(*ctx->trigger_buffer);
logic.length = ctx->trigger_stage * logic.unitsize;
logic.data = ctx->trigger_buffer;
sr_session_send(ctx->session_dev_id, &packet);
ctx->trigger_stage = TRIGGER_FIRED;
break;
}
} else if (ctx->trigger_stage > 0) {
/*
* We had a match before, but not in the next sample. However, we may
* have a match on this stage in the next bit -- trigger on 0001 will
* fail on seeing 00001, so we need to go back to stage 0 -- but at
* the next sample from the one that matched originally, which the
* counter increment at the end of the loop takes care of.
*/
i -= ctx->trigger_stage;
if (i < -1)
i = -1; /* Oops, went back past this buffer. */
/* Reset trigger stage. */
ctx->trigger_stage = 0;
}
}
}
if (ctx->trigger_stage == TRIGGER_FIRED) {
/* Send the incoming transfer to the session bus. */
const int trigger_offset_bytes = trigger_offset * sample_width;
packet.type = SR_DF_LOGIC;
packet.payload = &logic;
logic.length = transfer->actual_length - trigger_offset_bytes;
logic.unitsize = sample_width;
logic.data = cur_buf + trigger_offset_bytes;
sr_session_send(ctx->session_dev_id, &packet);
ctx->num_samples += cur_sample_count;
if (ctx->limit_samples &&
(unsigned int)ctx->num_samples > ctx->limit_samples) {
abort_acquisition(ctx);
free_transfer(transfer);
return;
}
} else {
/*
* TODO: Buffer pre-trigger data in capture
* ratio-sized buffer.
*/
}
resubmit_transfer(transfer);
}
static unsigned int to_bytes_per_ms(unsigned int samplerate)
{
return samplerate / 1000;
}
static size_t get_buffer_size(struct context *ctx)
{
size_t s;
/* The buffer should be large enough to hold 10ms of data and a multiple
* of 512. */
s = 10 * to_bytes_per_ms(ctx->cur_samplerate);
return (s + 511) & ~511;
}
static unsigned int get_number_of_transfers(struct context *ctx)
{
unsigned int n;
/* Total buffer size should be able to hold about 500ms of data */
n = 500 * to_bytes_per_ms(ctx->cur_samplerate) / get_buffer_size(ctx);
if (n > NUM_SIMUL_TRANSFERS)
return NUM_SIMUL_TRANSFERS;
return n;
}
static unsigned int get_timeout(struct context *ctx)
{
size_t total_size;
unsigned int timeout;
total_size = get_buffer_size(ctx) * get_number_of_transfers(ctx);
timeout = total_size / to_bytes_per_ms(ctx->cur_samplerate);
return timeout + timeout / 4; /* Leave a headroom of 25% percent */
}
static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
void *cb_data)
{
struct sr_datafeed_packet packet;
struct sr_datafeed_header header;
struct sr_datafeed_meta_logic meta;
struct context *ctx;
struct libusb_transfer *transfer;
const struct libusb_pollfd **lupfd;
unsigned int i;
int ret;
unsigned char *buf;
ctx = sdi->priv;
if (ctx->submitted_transfers != 0)
return SR_ERR;
ctx->session_dev_id = cb_data;
ctx->num_samples = 0;
ctx->empty_transfer_count = 0;
const unsigned int timeout = get_timeout(ctx);
const unsigned int num_transfers = get_number_of_transfers(ctx);
const size_t size = get_buffer_size(ctx);
ctx->transfers = g_try_malloc0(sizeof(*ctx->transfers) * num_transfers);
if (!ctx->transfers)
return SR_ERR;
ctx->num_transfers = num_transfers;
for (i = 0; i < num_transfers; i++) {
if (!(buf = g_try_malloc(size))) {
sr_err("fx2lafw: %s: buf malloc failed.", __func__);
return SR_ERR_MALLOC;
}
transfer = libusb_alloc_transfer(0);
libusb_fill_bulk_transfer(transfer, ctx->usb->devhdl,
2 | LIBUSB_ENDPOINT_IN, buf, size,
receive_transfer, ctx, timeout);
if (libusb_submit_transfer(transfer) != 0) {
libusb_free_transfer(transfer);
g_free(buf);
abort_acquisition(ctx);
return SR_ERR;
}
ctx->transfers[i] = transfer;
ctx->submitted_transfers++;
}
lupfd = libusb_get_pollfds(usb_context);
for (i = 0; lupfd[i]; i++)
sr_source_add(lupfd[i]->fd, lupfd[i]->events,
timeout, receive_data, NULL);
free(lupfd); /* NOT g_free()! */
packet.type = SR_DF_HEADER;
packet.payload = &header;
header.feed_version = 1;
gettimeofday(&header.starttime, NULL);
sr_session_send(cb_data, &packet);
/* Send metadata about the SR_DF_LOGIC packets to come. */
packet.type = SR_DF_META_LOGIC;
packet.payload = &meta;
meta.samplerate = ctx->cur_samplerate;
meta.num_probes = ctx->sample_wide ? 16 : 8;
sr_session_send(cb_data, &packet);
if ((ret = command_start_acquisition (ctx->usb->devhdl,
ctx->cur_samplerate, ctx->sample_wide)) != SR_OK) {
abort_acquisition(ctx);
return ret;
}
return SR_OK;
}
/* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
static int hw_dev_acquisition_stop(const struct sr_dev_inst *sdi,
void *cb_data)
{
/* Avoid compiler warnings. */
(void)cb_data;
abort_acquisition(sdi->priv);
return SR_OK;
}
SR_PRIV struct sr_dev_driver fx2lafw_driver_info = {
.name = "fx2lafw",
.longname = "fx2lafw (generic driver for FX2 based LAs)",
.api_version = 1,
.init = hw_init,
.cleanup = hw_cleanup,
.scan = hw_scan,
.dev_open = hw_dev_open,
.dev_close = hw_dev_close,
.info_get = hw_info_get,
.dev_config_set = hw_dev_config_set,
.dev_acquisition_start = hw_dev_acquisition_start,
.dev_acquisition_stop = hw_dev_acquisition_stop,
.instances = NULL,
};
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